THE NATURAL HISTORY OF DILATED CARDIOMYOPATHY (DCM) Thomas Zegkos Cardiomyopathies Lab AHEPA University Hospital

DEFINITION OF DILATED CARDIOMYOPATHY  “The presence of left ventricular dilatation and left ventricular systolic dysfunction in the absence of abnormal loading conditions (hypertension, valve disease) or coronary artery disease sufficient to cause global systolic impairment”. Elliot P et al. EHJ 2008 Elliot P et al. EHJ 2008

CAUSES OF DCM

CAUSES OF DCM IN PATIENTS WITH INITIALLY UNEXPLAINED CARDIOMYOPATHY Felker et al NEJM 2000 Felker et al NEJM 2000

EPIDEMIOLOGY OF IDCM  ANNUAL INCIDENCE 5-8/100,000  PREVALENCE 36/ 100,000  INCREASED RISK ASSOCIATED WITH:  MALE GENDER  BLACK RACE  CHRONIC BETA-AGONIST USE Dec GW, Fuster V. NEJM 1994;331:

FAMILIAR DCM  Over 20-50% of patients with IDCM  Over 30 genes responsible have been discovered GENES Lamin A/C δ-sarcoglycan Dystrophin Desmin Vinculin Titin Troponin-T α-tropomyosin ß-myosin heavy chain Actin Mitochondrial DNA mutations Fatkin D, et al. NEJM 1999;341

LAMINOPATHIES  6% of all DCM patients  7.5% of familiar forms  33% of DCM patients with conduction disturbances Parks S, et al, Am Heart J 2008

CLINICAL PRESENTATION OF DCM  Heart failure symptoms 75%-85%  Chest angina 8%-20%  Emboli (systemic or pulmonary) 1%-4%  Syncope <1%  Sudden cardiac death <1% Dec GW, Fuster V. NEJM 1994;331:

DCM EVALUATION  Detailed family history and screening of first degree relatives if necessary  Complete blood count  Metabolic panel  Thyroid function tests  Cardiac biomarkers  B-type natriuretic peptide assay  Chest radiography  Echocardiography  Cardiac magnetic resonance imaging (MRI)  Electrocardiography (ECG)  Endomyocardial biopsy may be useful in case of:  Recent onset of rapidly deteriorating cardiac function  Patients receiving chemotherapy with doxorubicin  Patients with systemic diseases with possible cardiac involvement (eg, hemochromatosis, sarcoidosis, amyloidosis, Löffler endocarditis, endomyocardial fibroelastosis)

NATURAL HISTORY OF DCM HEART FAILURE AND FUNCTIONAL STATUS SURVIVAL Asymptomatic 100% 0 Mild Moderate Severe ANNUAL MORTALITY < 5%10% % % CAUSE OF DEATH Υ SUDDEN DEATH40% CONGESTIVE HEART FAILURE 40% OTHER CAUSES 20% Acute event V McMurray JJ, et al. Lancet 2005

CAUSES OF DEATH BASED ON NYHA CLASS MERIT-HF study group. LANCET 1999

DIFFERENCES IN NATURAL HISTORY OF DCM ETIOLOGIES Felker et al NEJM 2000 Felker et al NEJM 2000

SURVIVAL IN IDCM VERSUS MYOCARDITIS Years Survival (%) Myocarditis (n=27) IDCM (n=58) Grogan, et al JACC 1995

SURVIVAL IN IDCM VERSUS ALCOHOLIC DCM Merello G, et al JACC: HEART FAILURE 2015

SURVIVAL IN IDCM VERSUS SARCOIDOSIS CARDIOMYOPATHY Yazaki Y, et al. Am J Cardiol 1998

NATURAL HISTORY OF LAMINOPATHIES  Age related penetrance with early onset atrial arrhythmias followed by conduction disease, often with mild LV dilatation and systolic dysfunction.  Over 60% of patients experience cardiovascular death or major cardiovascular events by the age of 45  46% of mortality of carriers due to sudden death Taylor G, et al. JACC 2003 Van Berlo J, et al. J Mol Med 2005

PROGNOSTIC FACTORS OF DCM  ECHOCARDIOGRAPHIC FINDINGS  Degree of impairment in LVEF  Extent of left ventricular enlargement  Diastolic dysfunction  Coexistent right ventricular dysfunction  CLINICAL FINDINGS  Favorable prognosis: NYHA < IV, younger age, female sex  Poor prognosis: Syncope, persistent S3 gallop, right- sided heart failure, atrial fibrillation, AV or bundle branch block, hyponatremia, troponin elevation, increased BNP, maximum oxygen uptake < 12 mg/kg/min

AHA/ACC 2013 AND ESC 2015 INDICATIONS FOR ICD IMPLANTATION IN DCM Predictors of SCD used in the guidelines also predict overall mortality and simply reflect severity of disease.

 45 studies DCM patients enrolled Goldberger J, et al. JACC 2014

SYNCOPE IN DCM  Syncopal events imply a higher risk of SCD regardless of the proven etiology of the syncope.  These patients with ICD implantation receive similar clinical benefits to secondary prevention cases. Knight B, et al. JACC 1999

LATE GADOLINIUM ENHANCEMENT Gulati A, et al. JAMA 2013

LAMINOPATHIES  RISK FACTORS FOR MAJOR EVENTS IN 269 PATIENTS  Baseline LVEF < 45%  Non-sustained ventricular tachycardia  Male gender van Rijsingen IA, et al. JACC 2012

 373 patients with an evaluation consistent with IDCM or myocarditis  Fewer than 6 months of symptom duration McNamara D et al. JACC 2011

LVEF IMPROVEMENT IN IDCM AFTER OMT (IMAC2 STUDY)  Solid bars: lvedd <6,00 cm  Shaded bars: lvedd 6,00 to 7,00 cm  Open bars: lvedd >7,00 cm McNamara D et al. JACC % demonstrated an increase of 10 ejection fraction units, 39% demonstrated an increase of 20 U or more. In 25% the LVEF had normalized (0.50 or more).

LVEF IMPROVEMENT IN ALCOHOLIC DCM Merello G, et al JACC: HEART FAILURE 2015

LVEF IMPROVEMENT IN CHEMOTHERAPY INDUCED DCM Cardinale D, et al JACC 2010

LVEF IMPROVEMENT IN CARDIAC SARCOIDOSIS Chou CZ, et al. Am J Cardiol 2004

ROLE OF LVEF IMPROVEMENT ON THE NATURAL HISTORY OF DCM Steimle AE, et al. JACC 1994;23:553-9

SURVIVAL IN IDCM ( )  25-30% annual mortality  50% five-year mortality Dec GW, Fuster V. NEJM 1994;331:

SURVIVAL IN IMAC2 (2011)  94% transplant free survival at 1 st year  88% at 4 years McNamara D et al. JACC 2011

 603 patients with IDCM  4 enrollment periods: Castelli G, et al. Circ Heart Fail. 2013

CHANGES IN MANAGEMENT OF DCM Castelli G, et al. Circ Heart Fail. 2013

CHANGES IN MANAGEMENT OF DCM Castelli G, et al. Circ Heart Fail. 2013

CARDIOVASCULAR AND HEART FAILURE MORTALITY REDUCTION  HF mortality decreased:  53% for period 2  74% for period 3  90% for period 4 compared to period 1  5 year event-free rate:  62% for period 1  74% for period 2  84% for period 3  93% for period 4 Castelli G, et al. Circ Heart Fail. 2013

SUDDEN DEATH RATE REDUCTION  87% risk reduction in period compared to period Castelli G, et al. Circ Heart Fail. 2013

AHEPA CARDIOMYOPATHIES CENTER COHORT  183 DCM patients

AHEPA CARDIOMYOPATHIES CENTER COHORT  183 DCM patients

AHEPA CARDIOMYOPATHIES CENTER COHORT  After a mean follow up of 6±4 years, 9,8% died  NYHA class and LVEF were independent predictors P=0,02P=0,009

AHEPA CARDIOMYOPATHIES CENTER COHORT  1,6% suffered SCD  18% of the patients received ICD

AHEPA CARDIOMYOPATHIES CENTER COHORT  21% of ICD patients received appropriate interventions

CONCLUSIONS  DCM is an heterogeneous disease with variable natural history.  The natural history of DCM has changed substantially over the last decades.  The prognostic factors of DCM, especially for SCD, still remain a subject of controversy.

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